I Rayleigh scattering VS Raman scattering

Ebi Rogha
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When studying incidental photons, when should I use elastic scattering (Rayleigh scattering) and when inelastic scattering (Raman Scattering)?
What is the application of each of them?
 
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Ebi Rogha said:
I do not understand when we use elastic approach and when use inelastic approach for:
1- an incident light
2-an incident single photon
Is this an idle question? Or, is there some specific reason for asking?
 
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